Malicious PDF — malware analysis report

Static analysis result for SHA-256 892722446b5f0cc8…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 07:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f291cb0daf00375f664ebefe83cd3d4f SHA-1: b19524b904812aa31eba7d74e400785b4c19f255 SHA-256: 892722446b5f0cc8d0c596e0db5d3cfef385aab271d2d8133baeef0522c72a82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host further PDF files. These secondary PDFs are likely designed to lure users into phishing scams or to download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4724ce67f7---dovolewagexodixisunasub.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160823655d3a0d---jozimubiki.pdf
    • http://askort.pl/Upload/file/busekajonewupe.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bfb6e9718801c7d7b19d0529a1bdc2bc/sovewazojez.pdf
    • http://studiocalderini.it/userfiles/files/95366788128.pdf
    • http://kursadowicz.pl/Upload/file/jujogupetigume.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ra86v7f5l5lnbtpitilqvi11a7/1362211953.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c69c3760d5e23cbf0c8892393a9e7f4f/51807738861.pdf
    • http://harchovyk.com/userfiles/file/mujajezafakizuluvepob.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c147e0bc879---92390320085.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c046eee1403---80681746520.pdf
    • http://canhtoanland.com/upload/files/66714674160.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2a248c12c16dbb0c26717afdd6074520/buwonesozoge.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vrpfigba3gfho14qvlufldhcj1/gedeko.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3b8bf40fa---vejetu.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c7844a246ab---demitasito.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609049779055b---kuxasasojigutaparine.pdf
    • http://arabic.cz/ckfinder/userfiles/files/34530889902.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/uph6ndeg1b1lf0bbuhn43a2as1/mubexilexubeliga.pdf
    • http://beta-rc.com/upload/files/78999202590.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a842267dd01---38473956342.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c5e5df997---61928459915.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=english+name+start+with+n+for+girl
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd2.bin
aefb9861df944fb19cd97d8f42186526f08fa85916987c32d09807f77bd87f6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 10728 bytes
font_01_sfnt_off00010651.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 16792 bytes
font_02_sfnt_off00011e63.bin
374475f4e920153f368f81c9aeb00953560b7913c36e2bf2e2a2d61912ddf906
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 17196 bytes